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INCOME TAXES (Schedule of Changes of Valuation Allowance) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Beginning balance	$ 38,729,208	$ 42,362,849	$ 50,109,751
Reversal	(24,771)	(932,833)	(5,708,268)
Foreign exchange effect	2,612,012	(2,700,808)	(2,038,634)
Ending Balance	$ 41,316,449	$ 38,729,208	$ 42,362,849

X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset resulting from the effect of foreign exchange rates.

+ References

No definition available.

+ Details

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Namespace Prefix:	dq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant

X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318

+ Details

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